Question Number 103755 by bramlex last updated on 17/Jul/20
$$\underset{{n}\:=\:\mathrm{3}} {\overset{\infty} {\prod}}\left(\mathrm{1}−\mathrm{tan}\:^{\mathrm{4}} \left(\frac{\pi}{\mathrm{2}^{{n}} }\right)\right)\:=\:? \\ $$
n-3-1-tan-4-pi-2-n-